1/2+1/3*2+1/4*3+1/5*4+1/6*5+.+1/2009*2008=?还有套用什么工程式.
3个回答
1/2+1/3*2+1/4*3+1/5*4+1/6*5+.+1/2009*2008
=1-1/2+1/2-1/3+……+1/2008-1/2009
=1-1/2009
=2008/2009
相关问题
1/1*2 + 1/2*3 + 1/3*4 + 1/4*5 + 1/5*6 + ……+ 1/2008*2009
1+(-2)+3+(-4)+5+(-6)+.+2007+(-2008)+2009 1+(-2)+(-3)+4+5+(-6
|1/3-1/2|+|1/4-1/3|+|1/5-1/6|+...+|1/2009-1/2008|=?
1-2+3-4+5-6+...+2008-2009=
1*(2*3)/(3*4)*(4*5)/(5*6)*……*(2008*2009)/(2009*2010)等于?
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+......1/2008x2009
1-2+3-4+5-6+…+2007-2008+2009.
1-2+3-4+5-6+…+2007-2008+2009.
1+(-2)+3+(-4)+5+(-6)+.+2007+(-2008)+2009
1+(﹣2)+(﹣3)+4+5+(﹣6)···+2008+2009 现在!